walkingstick vs stick insect

walkingstick and stick insect both are nouns.

Word	Noun	Adjective	Verb	Adverb
walkingstick	Yes	No	No	No
stick insect	Yes	No	No	No

As nouns, walkingstick and stick insect are synonyms defined as:

walkingstick and stick insect: any of various mostly tropical insects having long twiglike bodies

Other synonyms of walkingstick include walking stick.

walkingstick (noun)	stick insect (noun)
any of various mostly tropical insects having long twiglike bodies	any of various mostly tropical insects having long twiglike bodies